Which of the following amino acids is a precursor for the synthesis of nitric oxide?

A Arginine ✓
B Glutamine
C Aspartic acid
D Lysine

Explanation

Arginine is a precursor for the synthesis of nitric oxide, a signaling molecule involved in various physiological processes, including vasodilation and neurotransmission.

Mnemonic

'Arg' = 'argument' for nitric oxide synthesis

Source

Berg et al., Biochemistry
Protein Metabolism Biochemistry Amino Acid Metabolism Hard MEDICAL Confidence: high